// Copyright 2022 PingCAP, Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once

#include <DataStreams/IProfilingBlockInputStream.h>

namespace DB
{

/**
 * An input stream always return empty block.
 */
class EmptyBlockInputStream : public IProfilingBlockInputStream
{
public:
    EmptyBlockInputStream(const Block & header_) : header(header_) {}

    String getName() const override
    {
        return "Empty";
    }

    Block getHeader() const override
    {
        return header;
    }

protected:
    Block readImpl() override
    {
        return {};
    }

private:
    Block header;
};
}
